TF2 Premium

It is worth (there is an item which costs 0,07$ or so) , but you won't make the same profit you would from CS:GO

Not that much profit, but by time.
Be a trader.

Most drops can't be sold in steam market. You have to trade hats to refs, keys and stuff, and get used to their economy(pretty much like any other, but converts this to that, that hat worths x$, and y€, bla bla bla, etc).

You're a few years late to the party, the TF2 item market (partially thanks to all the people using dozens, in some cases hundreds of dupe accounts to farm) is over saturated and items lose value over time at a fast rate unlike CS:GO items.

To give you an easy example, back when I started trading little over 2 years ago, 1 key was 6 ref. (in case you're not familiar with it, ref is what you get from your drops) but the last time I checked it was rougly 18-20 ref for a key.

Now its cost not expensive, just buy something in tf2 market (not sure that this action still has).

I remember buying a strange machina when keys were 2.3ref each. Then I sold it later on when it was worth a lot more. Got about $45 out of it.

It can when #100 crate will be added to drop